My problem with this theory is that it ignores almost the entire Saw franchise. We see in later films exactly how and why Jigsaw becomes who he is, and it isn't because of his childhood. While the theory is fun to consider, it's troublesome because Saw does a good job of explaining his origins without resorting to the Home Alone tie-in. It would be more fun to incorporate Kevin with The Collector, (From The Collector and The Collection) because they're sort of similar characters and his back story isn't explained in nearly the detail that Jigsaw/John's is.

Point taken, but if we throw in "The Good Son" (showing that this demon child transcends death itself) and "Party Monster" (early work of a killer pushing the limits of intensity and sanity) I think we have a Fantheory orgy

Also, he's not necessarily a reliable narrator, he's a manipulative man to say the least... He may say his back story is one thing so that you will feel a particular way about whatever he plans next

This is still arguable. I mean, Kevin could have just grown up a normal person who suppressed these ideas until something set him off. He could have reverted back to his insanity when his wife lost his child which in turn drove him to lose his wife.

You had me until choice of film. I've been 10 years old. First of all, stuff like South Park didn't even exist when Kevin McAllister was 10 - that didn't come out until I was like, 13, and I'm slightly younger than that character. Secondly, when I was 10, I liked violent movies. Most 10 year olds I knew did.

That's good for you, but Kevin McAllister literally could not have. It didn't exist until he was like, 15. He's even just before Beavis and Butthead. I literally can't think of an equivalent show he could have watched.

Ren and Stimpy, maybe? It wouldn't have been out during Home Alone, but it was out by the second one.

The second time Kevin is "abandoned," it is when he gets separated at the airport. His father was the one watching him and got distracted while having to run to catch the plane. Nitpicking, I know, but it's something to note.

I want to play a game. You have 8 hours to get a good night's sleep before your flight leaves for Paris, but you have to share the hide-a-bed with Fuller, who wets his pants if he has anything to drink. Fuller has been enjoying refreshing Pepsi beverages all night, and Buzz ate all the plain cheese pizza. Live or die... the choice is yours.